Electric heater



c. A.- CLARK AND F. w. BLAIR. ELECTRIC HEATER. `APPLICATION FILED MAY 24. T920.

1,378,324. l Patented May 17, 1921.

.Fijne- 2 -12 p layer of vitreous insulating UNIT-Eo staresL PATENT erica.

CHARLES ALBERT CLARK A N D FRANK 'WELLS BLAIR, 0F NEW YORK, N. Y.

ELECTRIC HEATER.

Specication of Letters Patent.

Patented May 1v, 1921.

To aZZwwm t may concern.'

Be it known that we, CHARLES ALERr CLARK, a citizen of the United States', residing at 506 Amsterdam avenue, and FRANK WELLS BLAIR, a citizen of the United States, residing at 145 East 39th street, both residents o New York city, in the county of New York and State of New York, have invented new and useful Improvements in Electric Heaters, of which the following is a specification.

Our invention relates to improvements in the general class of electrical heating appliances and is adapted to heating devices of various kinds but more particularly to such devices as electric soldering irons, laundry irons, stove tops' and the like, in which it is desirable to apply the heat to be utilized in as close proximity as possible to the surface to be heated.

One of the novel features of our invention consists in the application of a very thin material to the electrical heating member, upon which is superimposed a metallic heat conducting covering which is in intimate contact with and integral to the aforesaid insulating material.

Another valuable feature of our invention consists in the method of applying the metallic heat conducting covering by` the electro-deposition of the metal upon the vitreous insulating material.

These results areV preferably attained in the manner described in the following specifications andillustrated in the accompanying drawings, in which :1

Figure 1, is a longitudinal' section of a soldering iron.

Fig. 2, is a cross section showing the application.

Fig. 3, is an enlarged View of a partial section of Fig. 1 and Fig. 2.

In Figs. 1 and 2, the numeral 1, is an finsulating core adapted to receive the heating member 2, carrying the electric current, which is insulated by the thin vitreous material 3, upon which is deposited the metallic heat conducting covering 4.

The core 1, in Fig. 1. is provided with a passage or opening 13, extending through the longitudinal axis of the core 1, adapted to carry a copper heat conducting core'5, at one end and a hollow metallic tube 6, at the other end, both of which are made integral with eachv other by means of the electrodeposited .covering 4.

The'tube 6, which serves to'carry the leads to and from the heating member 1, carries the leads within the insulating coverings 7, and the heat insulating handle 8, through which pass the flexible leads 9.

The heating `member 2, is preferably wound around a portion of thel insulated core 5, and thence around the tip and body of the core 1.

In Fig. 2, the heating member 2, is carried upon the insulating support 10, set into a casing or the like 11, and the said member 2, is insulated by the thin vitreous insulating material 3, upon which is deposited the metallic heat conductive covering 4, which extends over, envelops and is made integral with the casing 11, by the electrically deposited metal 4.

The insulating support 10, is provided with an extension 14, adapted to insulate and carry metallic terminals 12, said extension passing through an opening provided in the casing 11.

Fig. 3, shows the preferable method of 'winding the heating member 2, in a thread or groove 15, cut upon the support or core 1.

Having thus described our invention and illustrated the same in the accompanying drawings, we do not confine ourselves to the exact means illustrated herein, only as the preferred embodiment of our invention, therefore,

1. An electric heater, comprising an insulating core, carrying an electric heating member, covered by a relatively thin layer of insulating material, upon which is an electro-deposited metallic heat conducting covering.'

2. An electric heater, comprising a hollow insulating core, a heat conducting tip projecting into said core, carrying an electric heating member wound upon and insulated therefrom, the heating member continuing its winding upon the periphery of said core,

said heating member covered by a thin layer carry upon its outer surface an electric heating member which is coated with a relatively thin layer of matte glaze or the like, upon which is deposited electrically, a metallic covering adapted t0 rapidly radiate heat.

4. An electric heater, comprising an electrically insulated supportvadapted to carry upon one or more surfaces, an electric heatlng member or members Which are covered 10 by a thin layer of glaze or enamel, upon Which vis deposited electrically, a metallic covering that is relatively thin.

5. An electric heater, comprising an insulating base, adapted t0 carry an electric heating member, which is covered by a thin layer of high refractory material, upon which is deposited electrically, a metallic covering of high heat conductivity.

CHARLES ALBERT CLARK. 'FRANK WELLS BLAR. 

